If you take the talent that drains your mana to give you an infinite barrier then the incoming damage shouldn't be an issue, but it's true that you can't recover from big mistakes as easily as some other classes can. Belo'vir will give you a ton of extra breathing room in case you mess something up. Polymorph and Repentance are functionally the same in this encounter since you just use them to take Sigryn out of the fight when she powers herself up, and the interrupt CD shouldn't matter either since the only thing you need to be using it on is the caster guy's big nuke.

Arcane feels pretty unique compared to a lot of the other classes due to the mana management mechanic. It makes the fight more a war of attrition than ever, since you can't afford to run your mana pool dry burning the bosses for too long, and you need to find safe windows for Evocation casts. Once I got used to keeping an eye on my mana and maintaining Prismatic Barrier the whole time I found it wasn't much different from the Ret/Demo versions.

I agree with you, but regarding Poly/Rep I do disagree. According to http://www.wowhead.com/retribution-artifact-challenge and from what I remember, Repentance lasts 60 seconds on the 1st application. Polymorph only lasts 20 seconds. So a 3 times shorter duration, which only makes diminishing returns that much more annoying to handle.

I agree with you, but regarding Poly/Rep I do disagree. According to http://www.wowhead.com/retribution-artifact-challenge and from what I remember, Repentance lasts 60 seconds on the 1st application. Polymorph only lasts 20 seconds. So a 3 times shorter duration, which only makes diminishing returns that much more annoying to handle.

Polymorph only has a slightly reduced duration during the challenge (the main difference is the 20 second cooldown and lack of regen). I can't remember exactly what the duration of the spell is but it lasts long enough to keep Sigryn out of the fight for the full duration of her buff without having to worry about diminishing returns. Keeping her sheeped outside of that window isn't necessary, so the diminishing returns shouldn't be an issue unless you're trying to keep her permanently CCd, which is what the unique Polymorph rules are in place to prevent. If anything I'd say it probably makes the fight harder to try and keep her Polymorphed for any longer than necessary, since you're risking the consistency of avoiding a critical mechanic in exchange for less hassle from her easier mechanics.

Retribution does have more wiggle room to abuse CC in this encounter, but I think Hammer of Justice is the main advantage they have since they can just use it to interrupt Sigryn's buff completely and keep on cleaving her. At lower gear levels where survivability is a real struggle Retribution seems like it has more viable alternate strategies in this regard, but I think with the level of gear that's accessible now it's more beneficial to focus on the critical mechanics and cleave as much as possible outside of them.

Polymorph only has a slightly reduced duration during the challenge (the main difference is the 20 second cooldown and lack of regen). I can't remember exactly what the duration of the spell is but it lasts long enough to keep Sigryn out of the fight for the full duration of her buff without having to worry about diminishing returns. Keeping her sheeped outside of that window isn't necessary, so the diminishing returns shouldn't be an issue unless you're trying to keep her permanently CCd, which is what the unique Polymorph rules are in place to prevent. If anything I'd say it probably makes the fight harder to try and keep her Polymorphed for any longer than necessary, since you're risking the consistency of avoiding a critical mechanic in exchange for less hassle from her easier mechanics.

Retribution does have more wiggle room to abuse CC in this encounter, but I think Hammer of Justice is the main advantage they have since they can just use it to interrupt Sigryn's buff completely and keep on cleaving her. At lower gear levels where survivability is a real struggle Retribution seems like it has more viable alternate strategies in this regard, but I think with the level of gear that's accessible now it's more beneficial to focus on the critical mechanics and cleave as much as possible outside of them.

Truth be told, I hadn't considered only CC'ing after she cast the spell. I'll try to integrate that on my next try :-) Seems a lot simpler

I've done prot pali and prot warrior but can't do Havoc DH for some reason, lol. I get to shadow phase and die instantly unless I just stay in a bubble. People say to fel rush twice right away but he's always way too far away for that to work.

Drag Xylem to the middle when fighting him during the Ice and Arcane phases. When he's about to teleport, Imprison him. He'll still port but, but take the prison with him which makes him very easy to see. Quick double jump upward and double Fel Rush get you there. Fighting close to the middle is key, use interrupts to move him there.